September Weather in Siren, United States

Last updated: June 24, 2025

In Siren, United States, the average temperature in September is a comfortable 17°C (63°F). However, you might experience a minimum chill of 1°C (33°F) and occasional warmth peaking at 32°C (90°F). Expect 97 mm (3.8 in) of precipitation over 11 days, with the air feeling relatively humid at an average of 81%. Prepare for a mix of weather during your visit!

September Temperature in Siren

In September in Siren, the average temperature is 17°C (63°F), with maximums reaching as high as 32°C (90°F) and minimums dropping to as low as 1°C (33°F). This variation makes it an ideal time for travelers to enjoy a range of outdoor activities, from warm sunny days to cooler evenings.

September Weather in Siren: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Siren, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siren, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (33°F).

Data source: Temperature data for Siren generated using information from the Copernicus Climate Change Service.

September Precipitation in Siren

In Siren in September, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.

September Precipitation Trends in Siren

The chart displays monthly precipitation patterns in Siren, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Siren, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Siren

In Siren in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

September Average Humidity in Siren

This chart illustrates the average monthly humidity levels in Siren, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Siren is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siren

In Siren in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Siren.

Maximum UV Index Levels in Siren for September

The chart shows the monthly maximum UV Index (UVI) for Siren in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Siren typically reaches 7, which falls under the high exposure category.

Data source: Siren September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Siren Compares to Other Months

Weather in Siren varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Siren, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Siren, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	22 mm (0.9 inches)	87%	low
February Weather	-9°C (16°F)	32 mm (1.3 inches)	90%	moderate
March Weather	0°C (32°F)	48 mm (1.9 inches)	85%	moderate
April Weather	5°C (42°F)	91 mm (3.6 inches)	84%	high
May Weather	14°C (58°F)	107 mm (4.2 inches)	78%	very high
June Weather	21°C (69°F)	90 mm (3.6 inches)	80%	very high
July Weather	22°C (73°F)	100 mm (3.9 inches)	81%	very high
August Weather	21°C (69°F)	126 mm (5.0 inches)	81%	very high
September Weather	17°C (63°F)	97 mm (3.8 inches)	81%	high
October Weather	8°C (47°F)	99 mm (3.9 inches)	84%	moderate
November Weather	0°C (32°F)	40 mm (1.6 inches)	88%	moderate
December Weather	-6°C (22°F)	56 mm (2.2 inches)	84%	low